Cassius m



( MM) 0. RICHMOND.

- ARTIFICIAL DENTURE. No. 277,934. PattentedMay 22,1883.

U ITED STATES ATENT OFFICE.

CASSIUS M. RICHMOND, OF NEW YORK, N. Y., ASSIGNOR TO THE RICHMOND TOOTH CROWN COMPANY, OF SAME PLACE.

ARTIFICIAL DENTURE.

SPECIFICATION forming part of Letters Patent No. 277,934, dated May 22, 1883.

Application filed January 8,1883. (No model.)

To all whom it may concern Be it known that I, OAssIUs M. RICHMOND, of the city, county, and State of New York, have invented a new and useful Improvement in Artificial Dentures, of which the following is a full, true, and exact description, reference being had to the accompanying drawings.

This improvement consists in a method of attaching artificialdentures by which they may By pro-- be readily removed from the mouth.

cesses of fixing said dentures to roots, for which I have made previous application, after the denture is fixed it has been impossible to removeit without cutting away the attachment 1 between it and the root. By my present improvement, however, the artificial dentures may be quickly removed from their supports by removing an attaching-screw without exposing the prepared root to injury from the fluids of the mouth. In the preparation of such roots, for which I have made another application, itis very important that they should be thoroughly protected from the fluids of the mouth, as otherwise they rapidly decay; and

it is therefore necessary that they be hermetically sealed or inolosed in a cup or terminal and inclosing-covering. By my improvement I attach such cup or covering to the roots, and I then attach the denture to said cup or cov- 0 ering bysome removable contrivance, the cup or covering remaining permanently upon the root, while the denture may be removed without disturbing such cup.

My invention will be readily understoodfrom the accompanying drawings, in which similar letters refer to similar parts.

Figure 1 represents a prepared root; Fig. 2, a cap to inclose the same; Fig. 3, a denture to be applied tothe cap, and Fig. .4 an attaching-screw to attach the denture and cap together; Fig. 5, a larger view of the denture,

showing the structure of the screw-thread;

Fig. 6, a view of my denture applied; Fig. 7, a view of my denture applied with an artificial a5 porcelain tooth-crown.

or represents the root. This should be prepared by closing the nerve-cavity and drilling in the manner fully described by me in another pending application. A suitable recess should be made in its end to receive a threaded tube 0 attached to the inclosing-cup. 0 represents such cup, which has within it and passing upward centrally a threaded tube, preferably threaded both inside and out, for the reception of the screw 9. This tube should be preferably closed at its upper end. The cup, it will be understood, is made to fit the periphery of the root exactly and to project partly under the free margin of the gum, and is the best form known to me, although such projection is not in all cases absolutely necessary, and the arrangement without such projection forms the subject of a separate application. The cup 6, provided with the threaded tube d, is put in position, by means of cement b upon the 'end 6 of the root and remains there permanently.

A previously-prepared artificial denture, F, is then placed upon the inclosing-cup. This denture or artificial tooth-crown must fit accurately the permanent cup, so as to pre- 0 vent the injurious efiect of the introduction of any food particles or fluids within it. The upper edges, both of the cup o and of the tooth-crown F, are beveled and cutaway fine,

so as to interfere as little as possible with 7 the overlapping gum. A screw, 9, passes through the artificial tooth-crown and into the threaded tube d, and thereby holds the crown firmly in position. Instead of making the artificial crown of gold, it may have attached 8 0- to it an artificial porcelain or other crown, as shown at H in Fig. 7, the other arrangements being the same. Of course other modes of attachment besides the screw 9 could be employed. I usually fill the cavity in the denturef, Fig. 6, with cement, so as to form a backing for it.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a prepared root, havo ing attached to it permanently an inclosingcup, with a removable denture or tooth-crown, substantially as described.

2. The combination of a root with an inolosing cap or covering sealing the end of said 5 root, said cap or covering having attached to it a threaded tube projecting upward into said root, substantially as described.

3. The combination of the root a, inclosscrew 9, the upper part of said denturef ing cap e, and closed threaded screw 61 with surrounding and fitting closely the ferrule of an artificial denture or tooth-crown, F, atthe cup 0, substantially as described.

tached thereto by screw 9, substantially as OASSIUS M. RICHMOND. 5 described. Witnesses:

4. The combination of the root a, inclos- OTTO BAUMANN, ing-cup e, artificial crown or denture f, and WILLIAM PAXTON. 

